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/*
* Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
* Copyright (c) 2002-2008 Atheros Communications, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* $FreeBSD: release/9.1.0/sys/dev/ath/ath_hal/ar5416/ar5416_cal.c 225421 2011-09-06 10:54:56Z adrian $
*/
#include "opt_ah.h"
#include "ah.h"
#include "ah_internal.h"
#include "ah_devid.h"
#include "ah_eeprom_v14.h"
#include "ar5212/ar5212.h" /* for NF cal related declarations */
#include "ar5416/ar5416.h"
#include "ar5416/ar5416reg.h"
#include "ar5416/ar5416phy.h"
/* Owl specific stuff */
#define NUM_NOISEFLOOR_READINGS 6 /* 3 chains * (ctl + ext) */
static void ar5416StartNFCal(struct ath_hal *ah);
static void ar5416LoadNF(struct ath_hal *ah, const struct ieee80211_channel *);
static int16_t ar5416GetNf(struct ath_hal *, struct ieee80211_channel *);
static uint16_t ar5416GetDefaultNF(struct ath_hal *ah, const struct ieee80211_channel *chan);
static void ar5416SanitizeNF(struct ath_hal *ah, int16_t *nf);
/*
* Determine if calibration is supported by device and channel flags
*/
/*
* ADC GAIN/DC offset calibration is for calibrating two ADCs that
* are acting as one by interleaving incoming symbols. This isn't
* relevant for 2.4GHz 20MHz wide modes because, as far as I can tell,
* the secondary ADC is never enabled. It is enabled however for
* 5GHz modes.
*
* It hasn't been confirmed whether doing this calibration is needed
* at all in the above modes and/or whether it's actually harmful.
* So for now, let's leave it enabled and just remember to get
* confirmation that it needs to be clarified.
*
* See US Patent No: US 7,541,952 B1:
* " Method and Apparatus for Offset and Gain Compensation for
* Analog-to-Digital Converters."
*/
static OS_INLINE HAL_BOOL
ar5416IsCalSupp(struct ath_hal *ah, const struct ieee80211_channel *chan,
HAL_CAL_TYPE calType)
{
struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
switch (calType & cal->suppCals) {
case IQ_MISMATCH_CAL:
/* Run IQ Mismatch for non-CCK only */
return !IEEE80211_IS_CHAN_B(chan);
case ADC_GAIN_CAL:
case ADC_DC_CAL:
/*
* Run ADC Gain Cal for either 5ghz any or 2ghz HT40.
*
* Don't run ADC calibrations for 5ghz fast clock mode
* in HT20 - only one ADC is used.
*/
if (IEEE80211_IS_CHAN_HT20(chan) &&
(IS_5GHZ_FAST_CLOCK_EN(ah, chan)))
return AH_FALSE;
if (IEEE80211_IS_CHAN_5GHZ(chan))
return AH_TRUE;
if (IEEE80211_IS_CHAN_HT40(chan))
return AH_TRUE;
return AH_FALSE;
}
return AH_FALSE;
}
/*
* Setup HW to collect samples used for current cal
*/
static void
ar5416SetupMeasurement(struct ath_hal *ah, HAL_CAL_LIST *currCal)
{
/* Start calibration w/ 2^(INIT_IQCAL_LOG_COUNT_MAX+1) samples */
OS_REG_RMW_FIELD(ah, AR_PHY_TIMING_CTRL4,
AR_PHY_TIMING_CTRL4_IQCAL_LOG_COUNT_MAX,
currCal->calData->calCountMax);
/* Select calibration to run */
switch (currCal->calData->calType) {
case IQ_MISMATCH_CAL:
OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_IQ);
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"%s: start IQ Mismatch calibration\n", __func__);
break;
case ADC_GAIN_CAL:
OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_GAIN);
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"%s: start ADC Gain calibration\n", __func__);
break;
case ADC_DC_CAL:
OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_DC_PER);
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"%s: start ADC DC calibration\n", __func__);
break;
case ADC_DC_INIT_CAL:
OS_REG_WRITE(ah, AR_PHY_CALMODE, AR_PHY_CALMODE_ADC_DC_INIT);
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"%s: start Init ADC DC calibration\n", __func__);
break;
}
/* Kick-off cal */
OS_REG_SET_BIT(ah, AR_PHY_TIMING_CTRL4, AR_PHY_TIMING_CTRL4_DO_CAL);
}
/*
* Initialize shared data structures and prepare a cal to be run.
*/
static void
ar5416ResetMeasurement(struct ath_hal *ah, HAL_CAL_LIST *currCal)
{
struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
/* Reset data structures shared between different calibrations */
OS_MEMZERO(cal->caldata, sizeof(cal->caldata));
cal->calSamples = 0;
/* Setup HW for new calibration */
ar5416SetupMeasurement(ah, currCal);
/* Change SW state to RUNNING for this calibration */
currCal->calState = CAL_RUNNING;
}
#if 0
/*
* Run non-periodic calibrations.
*/
static HAL_BOOL
ar5416RunInitCals(struct ath_hal *ah, int init_cal_count)
{
struct ath_hal_5416 *ahp = AH5416(ah);
struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
HAL_CHANNEL_INTERNAL ichan; /* XXX bogus */
HAL_CAL_LIST *curCal = ahp->ah_cal_curr;
HAL_BOOL isCalDone;
int i;
if (curCal == AH_NULL)
return AH_FALSE;
ichan.calValid = 0;
for (i = 0; i < init_cal_count; i++) {
/* Reset this Cal */
ar5416ResetMeasurement(ah, curCal);
/* Poll for offset calibration complete */
if (!ath_hal_wait(ah, AR_PHY_TIMING_CTRL4, AR_PHY_TIMING_CTRL4_DO_CAL, 0)) {
HALDEBUG(ah, HAL_DEBUG_ANY,
"%s: Cal %d failed to finish in 100ms.\n",
__func__, curCal->calData->calType);
/* Re-initialize list pointers for periodic cals */
cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL;
return AH_FALSE;
}
/* Run this cal */
ar5416DoCalibration(ah, &ichan, ahp->ah_rxchainmask,
curCal, &isCalDone);
if (!isCalDone)
HALDEBUG(ah, HAL_DEBUG_ANY,
"%s: init cal %d did not complete.\n",
__func__, curCal->calData->calType);
if (curCal->calNext != AH_NULL)
curCal = curCal->calNext;
}
/* Re-initialize list pointers for periodic cals */
cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL;
return AH_TRUE;
}
#endif
/*
* AGC calibration for the AR5416, AR9130, AR9160, AR9280.
*/
HAL_BOOL
ar5416InitCalHardware(struct ath_hal *ah, const struct ieee80211_channel *chan)
{
if (AR_SREV_MERLIN_10_OR_LATER(ah)) {
/* Disable ADC */
OS_REG_CLR_BIT(ah, AR_PHY_ADC_CTL,
AR_PHY_ADC_CTL_OFF_PWDADC);
/* Enable Rx Filter Cal */
OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL,
AR_PHY_AGC_CONTROL_FLTR_CAL);
}
/* Calibrate the AGC */
OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL);
/* Poll for offset calibration complete */
if (!ath_hal_wait(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_CAL, 0)) {
HALDEBUG(ah, HAL_DEBUG_ANY,
"%s: offset calibration did not complete in 1ms; "
"noisy environment?\n", __func__);
return AH_FALSE;
}
if (AR_SREV_MERLIN_10_OR_LATER(ah)) {
/* Enable ADC */
OS_REG_SET_BIT(ah, AR_PHY_ADC_CTL,
AR_PHY_ADC_CTL_OFF_PWDADC);
/* Disable Rx Filter Cal */
OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL,
AR_PHY_AGC_CONTROL_FLTR_CAL);
}
return AH_TRUE;
}
/*
* Initialize Calibration infrastructure.
*/
#define MAX_CAL_CHECK 32
HAL_BOOL
ar5416InitCal(struct ath_hal *ah, const struct ieee80211_channel *chan)
{
struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
HAL_CHANNEL_INTERNAL *ichan;
ichan = ath_hal_checkchannel(ah, chan);
HALASSERT(ichan != AH_NULL);
/* Do initial chipset-specific calibration */
if (! AH5416(ah)->ah_cal_initcal(ah, chan)) {
HALDEBUG(ah, HAL_DEBUG_ANY,
"%s: initial chipset calibration did "
"not complete in time; noisy environment?\n", __func__);
return AH_FALSE;
}
/* If there's PA Cal, do it */
if (AH5416(ah)->ah_cal_pacal)
AH5416(ah)->ah_cal_pacal(ah, AH_TRUE);
/*
* Do NF calibration after DC offset and other CALs.
* Per system engineers, noise floor value can sometimes be 20 dB
* higher than normal value if DC offset and noise floor cal are
* triggered at the same time.
*/
OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
/*
* This may take a while to run; make sure subsequent
* calibration routines check that this has completed
* before reading the value and triggering a subsequent
* calibration.
*/
/* Initialize list pointers */
cal->cal_list = cal->cal_last = cal->cal_curr = AH_NULL;
/*
* Enable IQ, ADC Gain, ADC DC Offset Cals
*/
if (AR_SREV_HOWL(ah) || AR_SREV_SOWL_10_OR_LATER(ah)) {
/* Setup all non-periodic, init time only calibrations */
/* XXX: Init DC Offset not working yet */
#if 0
if (ar5416IsCalSupp(ah, chan, ADC_DC_INIT_CAL)) {
INIT_CAL(&cal->adcDcCalInitData);
INSERT_CAL(cal, &cal->adcDcCalInitData);
}
/* Initialize current pointer to first element in list */
cal->cal_curr = cal->cal_list;
if (cal->ah_cal_curr != AH_NULL && !ar5416RunInitCals(ah, 0))
return AH_FALSE;
#endif
}
/* If Cals are supported, add them to list via INIT/INSERT_CAL */
if (ar5416IsCalSupp(ah, chan, ADC_GAIN_CAL)) {
INIT_CAL(&cal->adcGainCalData);
INSERT_CAL(cal, &cal->adcGainCalData);
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"%s: enable ADC Gain Calibration.\n", __func__);
}
if (ar5416IsCalSupp(ah, chan, ADC_DC_CAL)) {
INIT_CAL(&cal->adcDcCalData);
INSERT_CAL(cal, &cal->adcDcCalData);
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"%s: enable ADC DC Calibration.\n", __func__);
}
if (ar5416IsCalSupp(ah, chan, IQ_MISMATCH_CAL)) {
INIT_CAL(&cal->iqCalData);
INSERT_CAL(cal, &cal->iqCalData);
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"%s: enable IQ Calibration.\n", __func__);
}
/* Initialize current pointer to first element in list */
cal->cal_curr = cal->cal_list;
/* Kick off measurements for the first cal */
if (cal->cal_curr != AH_NULL)
ar5416ResetMeasurement(ah, cal->cal_curr);
/* Mark all calibrations on this channel as being invalid */
ichan->calValid = 0;
return AH_TRUE;
#undef MAX_CAL_CHECK
}
/*
* Entry point for upper layers to restart current cal.
* Reset the calibration valid bit in channel.
*/
HAL_BOOL
ar5416ResetCalValid(struct ath_hal *ah, const struct ieee80211_channel *chan)
{
struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
HAL_CHANNEL_INTERNAL *ichan = ath_hal_checkchannel(ah, chan);
HAL_CAL_LIST *currCal = cal->cal_curr;
if (!AR_SREV_SOWL_10_OR_LATER(ah))
return AH_FALSE;
if (currCal == AH_NULL)
return AH_FALSE;
if (ichan == AH_NULL) {
HALDEBUG(ah, HAL_DEBUG_ANY,
"%s: invalid channel %u/0x%x; no mapping\n",
__func__, chan->ic_freq, chan->ic_flags);
return AH_FALSE;
}
/*
* Expected that this calibration has run before, post-reset.
* Current state should be done
*/
if (currCal->calState != CAL_DONE) {
HALDEBUG(ah, HAL_DEBUG_ANY,
"%s: Calibration state incorrect, %d\n",
__func__, currCal->calState);
return AH_FALSE;
}
/* Verify Cal is supported on this channel */
if (!ar5416IsCalSupp(ah, chan, currCal->calData->calType))
return AH_FALSE;
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"%s: Resetting Cal %d state for channel %u/0x%x\n",
__func__, currCal->calData->calType, chan->ic_freq,
chan->ic_flags);
/* Disable cal validity in channel */
ichan->calValid &= ~currCal->calData->calType;
currCal->calState = CAL_WAITING;
return AH_TRUE;
}
/*
* Recalibrate the lower PHY chips to account for temperature/environment
* changes.
*/
static void
ar5416DoCalibration(struct ath_hal *ah, HAL_CHANNEL_INTERNAL *ichan,
uint8_t rxchainmask, HAL_CAL_LIST *currCal, HAL_BOOL *isCalDone)
{
struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
/* Cal is assumed not done until explicitly set below */
*isCalDone = AH_FALSE;
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"%s: %s Calibration, state %d, calValid 0x%x\n",
__func__, currCal->calData->calName, currCal->calState,
ichan->calValid);
/* Calibration in progress. */
if (currCal->calState == CAL_RUNNING) {
/* Check to see if it has finished. */
if (!(OS_REG_READ(ah, AR_PHY_TIMING_CTRL4) & AR_PHY_TIMING_CTRL4_DO_CAL)) {
HALDEBUG(ah, HAL_DEBUG_PERCAL,
"%s: sample %d of %d finished\n",
__func__, cal->calSamples,
currCal->calData->calNumSamples);
/*
* Collect measurements for active chains.
*/
currCal->calData->calCollect(ah);
if (++cal->calSamples >= currCal->calData->calNumSamples) {
int i, numChains = 0;
for (i = 0; i < AR5416_MAX_CHAINS; i++) {
if (rxchainmask & (1 << i))
numChains++;
}
/*
* Process accumulated data
*/
currCal->calData->calPostProc(ah, numChains);
/* Calibration has finished. */
ichan->calValid |= currCal->calData->calType;
currCal->calState = CAL_DONE;
*isCalDone = AH_TRUE;
} else {
/*
* Set-up to collect of another sub-sample.
*/
ar5416SetupMeasurement(ah, currCal);
}
}
} else if (!(ichan->calValid & currCal->calData->calType)) {
/* If current cal is marked invalid in channel, kick it off */
ar5416ResetMeasurement(ah, currCal);
}
}
/*
* Internal interface to schedule periodic calibration work.
*/
HAL_BOOL
ar5416PerCalibrationN(struct ath_hal *ah, struct ieee80211_channel *chan,
u_int rxchainmask, HAL_BOOL longcal, HAL_BOOL *isCalDone)
{
struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
HAL_CAL_LIST *currCal = cal->cal_curr;
HAL_CHANNEL_INTERNAL *ichan;
int r;
OS_MARK(ah, AH_MARK_PERCAL, chan->ic_freq);
*isCalDone = AH_TRUE;
/*
* Since ath_hal calls the PerCal method with rxchainmask=0x1;
* override it with the current chainmask. The upper levels currently
* doesn't know about the chainmask.
*/
rxchainmask = AH5416(ah)->ah_rx_chainmask;
/* Invalid channel check */
ichan = ath_hal_checkchannel(ah, chan);
if (ichan == AH_NULL) {
HALDEBUG(ah, HAL_DEBUG_ANY,
"%s: invalid channel %u/0x%x; no mapping\n",
__func__, chan->ic_freq, chan->ic_flags);
return AH_FALSE;
}
/*
* For given calibration:
* 1. Call generic cal routine
* 2. When this cal is done (isCalDone) if we have more cals waiting
* (eg after reset), mask this to upper layers by not propagating
* isCalDone if it is set to TRUE.
* Instead, change isCalDone to FALSE and setup the waiting cal(s)
* to be run.
*/
if (currCal != AH_NULL &&
(currCal->calState == CAL_RUNNING ||
currCal->calState == CAL_WAITING)) {
ar5416DoCalibration(ah, ichan, rxchainmask, currCal, isCalDone);
if (*isCalDone == AH_TRUE) {
cal->cal_curr = currCal = currCal->calNext;
if (currCal->calState == CAL_WAITING) {
*isCalDone = AH_FALSE;
ar5416ResetMeasurement(ah, currCal);
}
}
}
/* Do NF cal only at longer intervals */
if (longcal) {
/* Do PA calibration if the chipset supports */
if (AH5416(ah)->ah_cal_pacal)
AH5416(ah)->ah_cal_pacal(ah, AH_FALSE);
/* Do open-loop temperature compensation if the chipset needs it */
if (ath_hal_eepromGetFlag(ah, AR_EEP_OL_PWRCTRL))
AH5416(ah)->ah_olcTempCompensation(ah);
/*
* Get the value from the previous NF cal
* and update the history buffer.
*/
r = ar5416GetNf(ah, chan);
if (r == 0 || r == -1) {
/* NF calibration result isn't valid */
HALDEBUG(ah, HAL_DEBUG_UNMASKABLE, "%s: NF calibration"
" didn't finish; delaying CCA\n", __func__);
} else {
/*
* NF calibration result is valid.
*
* Load the NF from history buffer of the current channel.
* NF is slow time-variant, so it is OK to use a
* historical value.
*/
ar5416LoadNF(ah, AH_PRIVATE(ah)->ah_curchan);
/* start NF calibration, without updating BB NF register*/
ar5416StartNFCal(ah);
}
}
return AH_TRUE;
}
/*
* Recalibrate the lower PHY chips to account for temperature/environment
* changes.
*/
HAL_BOOL
ar5416PerCalibration(struct ath_hal *ah, struct ieee80211_channel *chan,
HAL_BOOL *isIQdone)
{
struct ath_hal_5416 *ahp = AH5416(ah);
struct ar5416PerCal *cal = &AH5416(ah)->ah_cal;
HAL_CAL_LIST *curCal = cal->cal_curr;
if (curCal != AH_NULL && curCal->calData->calType == IQ_MISMATCH_CAL) {
return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask,
AH_TRUE, isIQdone);
} else {
HAL_BOOL isCalDone;
*isIQdone = AH_FALSE;
return ar5416PerCalibrationN(ah, chan, ahp->ah_rx_chainmask,
AH_TRUE, &isCalDone);
}
}
static HAL_BOOL
ar5416GetEepromNoiseFloorThresh(struct ath_hal *ah,
const struct ieee80211_channel *chan, int16_t *nft)
{
if (IEEE80211_IS_CHAN_5GHZ(chan)) {
ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_5, nft);
return AH_TRUE;
}
if (IEEE80211_IS_CHAN_2GHZ(chan)) {
ath_hal_eepromGet(ah, AR_EEP_NFTHRESH_2, nft);
return AH_TRUE;
}
HALDEBUG(ah, HAL_DEBUG_ANY, "%s: invalid channel flags 0x%x\n",
__func__, chan->ic_flags);
return AH_FALSE;
}
static void
ar5416StartNFCal(struct ath_hal *ah)
{
OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF);
OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
}
static void
ar5416LoadNF(struct ath_hal *ah, const struct ieee80211_channel *chan)
{
static const uint32_t ar5416_cca_regs[] = {
AR_PHY_CCA,
AR_PHY_CH1_CCA,
AR_PHY_CH2_CCA,
AR_PHY_EXT_CCA,
AR_PHY_CH1_EXT_CCA,
AR_PHY_CH2_EXT_CCA
};
struct ar5212NfCalHist *h;
int i;
int32_t val;
uint8_t chainmask;
int16_t default_nf = ar5416GetDefaultNF(ah, chan);
/*
* Force NF calibration for all chains.
*/
if (AR_SREV_KITE(ah)) {
/* Kite has only one chain */
chainmask = 0x9;
} else if (AR_SREV_MERLIN(ah) || AR_SREV_KIWI(ah)) {
/* Merlin/Kiwi has only two chains */
chainmask = 0x1B;
} else {
chainmask = 0x3F;
}
/*
* Write filtered NF values into maxCCApwr register parameter
* so we can load below.
*/
h = AH5416(ah)->ah_cal.nfCalHist;
HALDEBUG(ah, HAL_DEBUG_NFCAL, "CCA: ");
for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) {
/* Don't write to EXT radio CCA registers unless in HT/40 mode */
/* XXX this check should really be cleaner! */
if (i > 2 && !IEEE80211_IS_CHAN_HT40(chan))
continue;
if (chainmask & (1 << i)) {
int16_t nf_val;
if (h)
nf_val = h[i].privNF;
else
nf_val = default_nf;
val = OS_REG_READ(ah, ar5416_cca_regs[i]);
val &= 0xFFFFFE00;
val |= (((uint32_t) nf_val << 1) & 0x1ff);
HALDEBUG(ah, HAL_DEBUG_NFCAL, "[%d: %d]", i, nf_val);
OS_REG_WRITE(ah, ar5416_cca_regs[i], val);
}
}
HALDEBUG(ah, HAL_DEBUG_NFCAL, "\n");
/* Load software filtered NF value into baseband internal minCCApwr variable. */
OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_ENABLE_NF);
OS_REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NO_UPDATE_NF);
OS_REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF);
/* Wait for load to complete, should be fast, a few 10s of us. */
if (! ar5212WaitNFCalComplete(ah, 1000)) {
/*
* We timed out waiting for the noisefloor to load, probably due to an
* in-progress rx. Simply return here and allow the load plenty of time
* to complete before the next calibration interval. We need to avoid
* trying to load -50 (which happens below) while the previous load is
* still in progress as this can cause rx deafness. Instead by returning
* here, the baseband nf cal will just be capped by our present
* noisefloor until the next calibration timer.
*/
HALDEBUG(ah, HAL_DEBUG_UNMASKABLE, "Timeout while waiting for "
"nf to load: AR_PHY_AGC_CONTROL=0x%x\n",
OS_REG_READ(ah, AR_PHY_AGC_CONTROL));
return;
}
/*
* Restore maxCCAPower register parameter again so that we're not capped
* by the median we just loaded. This will be initial (and max) value
* of next noise floor calibration the baseband does.
*/
for (i = 0; i < AR5416_NUM_NF_READINGS; i ++)
/* Don't write to EXT radio CCA registers unless in HT/40 mode */
/* XXX this check should really be cleaner! */
if (i > 2 && !IEEE80211_IS_CHAN_HT40(chan))
continue;
if (chainmask & (1 << i)) {
val = OS_REG_READ(ah, ar5416_cca_regs[i]);
val &= 0xFFFFFE00;
val |= (((uint32_t)(-50) << 1) & 0x1ff);
OS_REG_WRITE(ah, ar5416_cca_regs[i], val);
}
}
/*
* This just initialises the "good" values for AR5416 which
* may not be right; it'lll be overridden by ar5416SanitizeNF()
* to nominal values.
*/
void
ar5416InitNfHistBuff(struct ar5212NfCalHist *h)
{
int i, j;
for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) {
h[i].currIndex = 0;
h[i].privNF = AR5416_CCA_MAX_GOOD_VALUE;
h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX;
for (j = 0; j < AR512_NF_CAL_HIST_MAX; j ++)
h[i].nfCalBuffer[j] = AR5416_CCA_MAX_GOOD_VALUE;
}
}
/*
* Update the noise floor buffer as a ring buffer
*/
static void
ar5416UpdateNFHistBuff(struct ath_hal *ah, struct ar5212NfCalHist *h,
int16_t *nfarray)
{
int i;
/* XXX TODO: don't record nfarray[] entries for inactive chains */
for (i = 0; i < AR5416_NUM_NF_READINGS; i ++) {
h[i].nfCalBuffer[h[i].currIndex] = nfarray[i];
if (++h[i].currIndex >= AR512_NF_CAL_HIST_MAX)
h[i].currIndex = 0;
if (h[i].invalidNFcount > 0) {
if (nfarray[i] < AR5416_CCA_MIN_BAD_VALUE ||
nfarray[i] > AR5416_CCA_MAX_HIGH_VALUE) {
h[i].invalidNFcount = AR512_NF_CAL_HIST_MAX;
} else {
h[i].invalidNFcount--;
h[i].privNF = nfarray[i];
}
} else {
h[i].privNF = ar5212GetNfHistMid(h[i].nfCalBuffer);
}
}
}
static uint16_t
ar5416GetDefaultNF(struct ath_hal *ah, const struct ieee80211_channel *chan)
{
struct ar5416NfLimits *limit;
if (!chan || IEEE80211_IS_CHAN_2GHZ(chan))
limit = &AH5416(ah)->nf_2g;
else
limit = &AH5416(ah)->nf_5g;
return limit->nominal;
}
static void
ar5416SanitizeNF(struct ath_hal *ah, int16_t *nf)
{
struct ar5416NfLimits *limit;
int i;
if (IEEE80211_IS_CHAN_2GHZ(AH_PRIVATE(ah)->ah_curchan))
limit = &AH5416(ah)->nf_2g;
else
limit = &AH5416(ah)->nf_5g;
for (i = 0; i < AR5416_NUM_NF_READINGS; i++) {
if (!nf[i])
continue;
if (nf[i] > limit->max) {
HALDEBUG(ah, HAL_DEBUG_NFCAL,
"NF[%d] (%d) > MAX (%d), correcting to MAX\n",
i, nf[i], limit->max);
nf[i] = limit->max;
} else if (nf[i] < limit->min) {
HALDEBUG(ah, HAL_DEBUG_NFCAL,
"NF[%d] (%d) < MIN (%d), correcting to NOM\n",
i, nf[i], limit->min);
nf[i] = limit->nominal;
}
}
}
/*
* Read the NF and check it against the noise floor threshhold
*
* Return 0 if the NF calibration hadn't finished, 0 if it was
* invalid, or > 0 for a valid NF reading.
*/
static int16_t
ar5416GetNf(struct ath_hal *ah, struct ieee80211_channel *chan)
{
int16_t nf, nfThresh;
int i;
int retval = 0;
if (ar5212IsNFCalInProgress(ah)) {
HALDEBUG(ah, HAL_DEBUG_ANY,
"%s: NF didn't complete in calibration window\n", __func__);
nf = 0;
retval = -1; /* NF didn't finish */
} else {
/* Finished NF cal, check against threshold */
int16_t nfarray[NUM_NOISEFLOOR_READINGS] = { 0 };
HAL_CHANNEL_INTERNAL *ichan = ath_hal_checkchannel(ah, chan);
/* TODO - enhance for multiple chains and ext ch */
ath_hal_getNoiseFloor(ah, nfarray);
nf = nfarray[0];
ar5416SanitizeNF(ah, nfarray);
if (ar5416GetEepromNoiseFloorThresh(ah, chan, &nfThresh)) {
if (nf > nfThresh) {
HALDEBUG(ah, HAL_DEBUG_UNMASKABLE,
"%s: noise floor failed detected; "
"detected %d, threshold %d\n", __func__,
nf, nfThresh);
/*
* NB: Don't discriminate 2.4 vs 5Ghz, if this
* happens it indicates a problem regardless
* of the band.
*/
chan->ic_state |= IEEE80211_CHANSTATE_CWINT;
nf = 0;
retval = 0;
}
} else {
nf = 0;
retval = 0;
}
/* Update MIMO channel statistics, regardless of validity or not (for now) */
for (i = 0; i < 3; i++) {
ichan->noiseFloorCtl[i] = nfarray[i];
ichan->noiseFloorExt[i] = nfarray[i + 3];
}
ichan->privFlags |= CHANNEL_MIMO_NF_VALID;
ar5416UpdateNFHistBuff(ah, AH5416(ah)->ah_cal.nfCalHist, nfarray);
ichan->rawNoiseFloor = nf;
retval = nf;
}
return retval;
}